Spi 29-354-8 Class Zz Plus Plug Gage 0.354 in

Product Description

The SPI 29-354-8 is a Class ZZ Plus plug gage designed to verify bore and hole diameters to a nominal size of 0.354 inches. It holds a tolerance of 0.0002 inches, making it appropriate for go/no-go inspection work in production and quality-control environments. Constructed from steel, this gage provides the durability and dimensional stability required for repeated use on the shop floor or in an inspection department. Machinists, toolmakers, and quality technicians use plug gages like this one to confirm that drilled, reamed, or bored features meet print specifications before parts advance through the manufacturing process.

This gage is suited for dimensional inspection of holes and bores in metalworking, machining, and precision manufacturing applications. It is appropriate for both incoming inspection and in-process verification of features calling out a 0.354-inch nominal diameter. Class ZZ Plus gages are generally used for production-level checking where tight tolerances are required but master-grade precision is not specified. The compact size and low weight of 0.2 pounds make it easy to handle during high-volume inspection tasks.

Key Features

• Nominal diameter of 0.354 inches for direct bore inspection at that size
• Class ZZ Plus tolerance of 0.0002 inches for production-grade accuracy
• Steel construction for wear resistance and dimensional stability
• Lightweight at 0.2 pounds for comfortable single-hand use
• Single-piece package quantity suited for individual inspection stations

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for production inspection setups requiring a 0.354-inch nominal diameter Class ZZ Plus gage.

Installation Notes

Plug gages are handled by quality technicians and machinists; no special tools are required for use, but proper gage handling practices apply. Store the gage in a protected case when not in use to prevent surface damage that could affect accuracy. Clean the gage and the feature being checked before use to avoid false readings from chips or debris. Calibration intervals should follow the facility quality plan and applicable dimensional metrology standards.